title: Speech intelligibility with helicopter noise: tests of three helmet-mounted communication systems.
mesh_terms: D000328:Adult; D000368:Aged; D000401:Aircraft; D001359:Aviation; D003142:Communication; D006260:Head Protective Devices; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D008889:Military Personnel; D009622:Noise / Q000009:adverse effects*; D013067:Speech Perception; D013647:Task Performance and Analysis